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Recent Progress on the Donaldson–Thomas Theory
This book is an exposition of recent progress on the Donaldson–Thomas (DT) theory. The DT invariant was introduced by R. Thomas in 1998 as a virtual counting of stable coherent sheaves on Calabi–Yau 3-folds. Later, it turned out that the DT invariants have many interesting properties and appear in several contexts such as the Gromov–Witten/Donaldson–Thomas conjecture on curve-counting theories, wall-crossing in derived categories with respect to Bridgeland stability conditions, BPS state counting in string theory, and others. Recently, a deeper structure of the moduli spaces of coherent sheaves on Calabi–Yau 3-folds was found through derived algebraic geometry. These moduli spaces ...
Index Medicus
Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
List of Workers in Subjects Pertaining to Agriculture and Home Economics in the U.S. Department of Agriculture and in the State Agricultural Colleges and Experiment Stations
Contents: --pt. 1. U.S. Dept. of Agriculture. --pt. 2. State agricultural colleges and experiment stations.
Current List of Medical Literature
Includes section, "Recent book acquisitions" (varies: Recent United States publications) formerly published separately by the U.S. Army Medical Library.
Market Diseases of Fruits and Vegetables
The decade since the World War has been in many ways the most extraordinary period in American agriculture. For the first time in the Nation's history, the census of 1925 showed a decrease (since 1920) in crop acreage, in farm animals, in number of farms, and in farm population. Nevertheless, agricultural production increased more rapidly from 1922 to 1926, inclusive, than in any period since 1900, and probably since 1890, when the agricultural occupation of the prairies approached completion.
